Murr Cat Formula with Lamb and Pork. This is a combination of the Icelandic lamb with all its benefits and the Icelandic beef which in fact along with the lamb descended from the first cattle brought to Iceland by the Viking settlers. The Icelandic beef is considered disease free which makes it ideal and safe for your cat. All use of hormones or growth enhancers is prohibited in Icelandic live stock which guarantees the quality of all raw materials. This formula is a popular product loved by many cats.